Transmissive screen and diffusion plate

Abstract

A transmissive screen includes, sequentially from a projection side, a Fresnel lens having a condensing function, a diffusion plate for diffusing incident light, and a front-surface protective panel disposed facing the diffusion plate across an air flow layer of a predetermined interval. The front-surface protective panel partially absorbs visible light, and the visible light absorbance of the front-surface protective panel is made the highest compared with the Fresnel lens and the diffusion plate.

1. A transmissive screen comprising, sequentially from a projection side:
 a Fresnel lens having a condensing function; 
 a diffusion plate for diffusing incident light; and 
 a front-surface protective panel disposed facing the diffusion plate across an air flow gap therebetween of a predetermined interval, 
 wherein the transmissive screen does not include a lenticular lens sheet, the diffusion plate does not include a black stripe for absorbing visible light, and the front-surface protective panel partially absorbs visible light. 
 
     
     
       2. The transmissive screen of  claim 1 , wherein
 the diffusion plate partially absorbs visible light. 
 
     
     
       3. The transmissive screen of  claim 1 , wherein
 visible light absorbance of the fronturface protective panel is the highest compared with the Fresnel lens and the diffusion plate. 
 
     
     
       4. The transmissive screen of  claim 1 , wherein
 heat-resistant temperature of the front-surface protective panel is higher than heat-resistant temperature of at least the diffusion plate. 
 
     
     
       5. The transmissive screen of  claim 4 , wherein
 the front-surface protective panel is made of one of glass, acrylic resin, and polycarbonate resin. 
 
     
     
       6. The transmissive screen of  claim 1 , wherein
 antistatic treatment is applied to a surface of the protective panel. 
 
     
     
       7. A diffusion plate used for the transmissive screen of  claim 1 . 
     
     
       8. A transmissive screen comprising, sequentially from a projection side:
 a Fresnel lens having a condensing function; 
 a diffusion plate for diffusing incident light; and 
 a front-surface protective panel disposed facing the diffusion plate across an air flow gap therebetween of a predetermined interval, 
 wherein the transmissive screen does not include a lenticular lens sheet, the diffusion plate does not include a black stripe for absorbing visible light, and a layer for absorbing or reflecting infrared rays is formed on the front-surface protective panel. 
 
     
     
       9. The transmissive screen of  claim 8  , wherein
 heat-resistant temperature of the front-surface protective panel is higher than heat-resistant temperature of at least the diffusion plate. 
 
     
     
       10. A transmissive screen comprising, sequentially from a projection side:
 a Fresnel lens having a condensing function; 
 a diffusion plate for diffusing incident light; and 
 a front-surface protective panel disposed facing the diffusion plate across an air flow gap therebetween of a predetermined interval, 
 wherein the transmissive screen does not include a lenticular lens sheet, the diffusion plate does not include a black stripe for absorbing visible light, and a layer for absorbing or reflecting ultraviolet rays is formed on the front-surface protective panel. 
 
     
     
       11. The transmissive screen of  claim 10  , wherein
 heat-resistant temperature of the front-surface protective panel is higher than heat-resistant temperature of at least the diffusion plate. 
 
     
     
       12. A transmissive screen comprising, sequentially from a projection side:
 a Fresnel lens having a condensing function; 
 a diffusion plate for diffusing incident light; and 
 a front-surface protective panel disposed facing the diffusion plate across an air flow gap therebetween of a predetermined interval, 
 wherein the transmissive screen does not include a lenticular lens sheet, and the diffusion plate does not include a black stripe for absorbing visible light, and 
 wherein the front-surface protective panel has a protective substrate, a front-surface protective layer disposed on an observer side of the protective substrate, and a rear-surface protective layer disposed on the projection side of the protective substrate. 
 
     
     
       13. The transmissive screen of  claim 12 , wherein
 the protective substrate is glass material, the front-surface protective layer is an antireflection layer having a function of preventing or suppressing reflection of light, and the rear-surface protective layer is a light shielding layer having a function of shielding light of a partial wavelength region. 
 
     
     
       14. The transmissive screen of  claim 13 , wherein
 the protective substrate is tempered glass, the front-surface protective layer is a mat film, and the rear-surface protective layer is formed of at least one of an ultraviolet cut film and an infrared cut film. 
 
     
     
       15. The transmissive screen of  claim 13 , wherein
 the protective substrate is tempered glass, the front-surface protective layer is an antireflection film formed by a dip method, and the rear-surface protective layer is formed of at least one of an ultraviolet cut film and an infrared cut film. 
 
     
     
       16. The transmissive screen of  claim 14 , wherein
 the rear-surface protective layer is formed of two layers, the two layers are an ultraviolet cut film layer and an infrared cut film layer. 
 
     
     
       17. The transmissive screen of  claim 15 , wherein
 the rear-surface protective layer is formed of two layers, the two layers are an ultraviolet cut film layer and an infrared cut film layer.